Is It Permissible to Marry a Christian Lady Who Believes in Trinity?

Sheikh Muhammad Al-Hanooti, member of the North American Fiqh Council, states: “Christians are known as being Trinitarians since the year 325 C.E. The Prophet (peace and blessings be upon him) was commissioned in the year 611 C.E. The Christians of his era were Trinitarian. But the Qur’an calls them People of the Book even though they have the concept of the Trinity. The Qur’an allows a Muslim man to marry a Christian or a Jewish woman, but we should understand two facts:
1. When you want to marry a woman, of course you want to marry her to help you with your deen (religion). The Prophet (peace and blessings be upon him) encouraged us to look for a committed woman to her deen. If that is not your choice then it means that you are looking for an unhealthy marriage. Don’t forget that this woman will be the moulder of your children. How would she raise them to be good Muslims if she herself is not?
2. Muslim jurists do not hold it preferable to marry a non-Muslim woman in a non-Muslim country if there is any threat to the religion of the children or the man himself.